commit 5060a93f22e38b2a00a45dc4260b4048470d8911
author Zhao Fan <quic_zhaof@quicinc.com> Sat Jan 15 18:55:14 2022 +0800
committer Karsten Tausche <karsten@fairphone.com> Mon Jan 23 16:47:34 2023 +0100
tree 9409da7840e0ddddf099cb940db5e551d636b2bd
parent 9602d1d9b337b3ca5ac9fb355d5dcf4825c76f8f

IMS: Fix the crashes in MT conference call

1)mOriginalConnection in TelephonyConnection can be null
  once clearOriginalConnection() is called as the Connection
  is disconnected because of (IMS_MERGED_SUCCESSFULLY).
2)mTelephonyConnectionService in TelephonyConnection which hosting
  the ImsConference can be null once ImsConference is created
  before mTelephonyConnectionService is set on the Connection
  which passed in.

Change-Id: I47e3dd7966e9f788bc29f576938e09049eb63c2d
CRs-Fixed: 3016834 3101698
Issue: FP3-A13#68
[FP3: Add related changes of upstream merge 'Merge TP1A.220414.003']
(cherry picked from commit c5e97a4057104890148c4730db333d45f9ab032c)